I've got tired head boots so I'll do my math in the morning but let's say we have 100' of 1" copper before the meter. PVB for back flow. Use the ops 70psi static. What is the max zone size with a 5/8 meter and what is the max zone size 1" meter. Forget the surcharge for now.

With modern 5/8~3/4 meters (the loss curve below is from a Badger 5/8~3/4 meter) there isn't any advantage gained by a switch to a one-inch meter, when there's a long run of copper upstream. The copper is the limiting factor, especially if you are going to pay attention to water velocity.